An application should return nonzero in response to WM_ERASEBKGND if it processes the message and erases the background; this indicates that no further erasing is required. If the application returns zero, the window will remain ed for erasing. (Typically, this indicates that the fErase member of the PAINTSTRUCT structure will be TRUE.) 这个是摘自MSDN的关于返回值的解释，本人才疏学浅，看了半天没明白不同返回值的含义。我在对话框上画一个背景，最有拿返回1和返回0的结果进行比较，没法现对话框的背景有什么不同，请问是怎么回事?
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